The phrase "to form a gel" means to create a thick, jelly-like substance by combining a liquid with a substance called a gelatin or a gelling agent. This gelatinous substance becomes solid but still retains some liquid properties. Full definition
Once it enters the digestive tract, it mixes with water to form a gel in the digestive tract that binds to fatty acids. (dailyburn.com)
Additionally, this soluble fiber forms a gel that slows down nutrient absorption, preventing blood sugar spikes after meals heavy in carbohydrates. (herbazest.com)